<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    .content{
        width: 500px;
        height: 500px;
        margin: 0 auto;
        border: 1px solid black;
    }
    form{
        line-height:50px;
        margin-left: 25%;

    }

</style>
<body>
<div class="content">
    <form action="/register/" method="post">
        账户：<input type="text"  name="username" ><br>
        密码：<input type="password" name="userpasswd" ><br>
        <input type="submit" value="注册" >
    </form>
</div>
</body>
</html>